Well, we went out for our daily state-sanctioned singular walking exercise - about an hour going quite briskly around the local park. There were a number of other families and household groups doing the same. Everybody kept their distance. Polite waving if it was somebody you recognised. Nobody abused anybody else.
I agree - I have seen exactly the same thing. It was clear larger groups were members of the same household (e.g. 2 parents and 3 children) and everyone seemed to keep safe distance. Of course, you can always find a way to take a sensational picture (oh, there are still people walking in parks and enjoying the nice weather!) but what I have observed so far looked like full compliance with the spirit of the UK lockdown. All the ice cream vans were long gone.